Knights Armament200190216
Knights Armament Sr-25 K3 7.62 Nato/.308 16'' Bbl Assembled Upper Rcvr Black$3,230.34
Availability: In Stock
Current Stock: Out of stock
The Knights Armament SR-25 A2 is a 7.62 NATO/.308 assembled upper receiver purpose-built for shooters who demand precision at distance. This commercial variant of the M110A2 system brings proven military accuracy and reliability to your semi-automatic rifle build. Whether you're assembling a long-range hunting upper, a precision carbine for the range, or a duty-grade platform, the SR-25 A2 delivers the engineering that made the M110 platform a standard in precision rifle work.
The 20-inch barrel features a 5R cut rifled profile with a 1:10-inch twist rate, paired with a high-pressure dual ejector bolt designed to function reliably in suppressed and unsuppressed configurations, even in tough conditions. Fully ambidextrous controls across the receiver mean both left- and right-handed shooters get full ergonomic advantage without compromise. The integrated 2-stage trigger is tuned to support precision work without requiring additional tuning or parts swaps.
Mounted to the upper is the URX6 handguard—a rigid, impact-resistant design with seven sides of M-LOK slots and a continuous MILSTD-1913 rail across the top. This gives you maximum flexibility to mount optics, lights, lasers, or other modern accessories. The 7.62mm open brake mitigates recoil and is compatible with KAC 7.62mm QDC Signature Reduction Devices, so you can suppress this upper if your setup calls for it.
This is a complete assembled upper receiver—bolt carrier group and trigger are installed and ready to mate with your compatible lower receiver. It's a no-compromise choice for builders who refuse to compromise on accuracy or durability.
| Caliber | 7.62 NATO/.308 Winchester |
| Barrel Length | 20 inches |
| Barrel Profile | 5R cut rifled, dimpled |
| Twist Rate | 1:10 inch |
| Controls | Fully ambidextrous |
| Trigger | 2-stage drop-in trigger |
| Handguard | URX6 with M-LOK and MILSTD-1913 rail |
| Muzzle Device | 7.62mm open brake |
| Finish | Black |
The SR-25 A2 is an assembled upper receiver designed to pair with AR-10 pattern lower receivers that accept 7.62 NATO/.308 Winchester ammunition. Verify compatibility with your specific lower receiver before assembly.
Yes. The 7.62mm open brake is compatible with KAC 7.62mm QDC Signature Reduction Devices. The dual ejector bolt is specifically designed to cycle reliably both suppressed and unsuppressed.
Yes, this is a complete assembled upper receiver with the bolt carrier group and 2-stage trigger installed. You'll need to attach it to a compatible AR-10 lower receiver to complete your rifle.
The URX6 handguard features seven sides of M-LOK slots for mounting custom rail sections and accessories, plus a continuous MILSTD-1913 rail across the top for direct attachment of optics, lights, and other standard rail-mounted gear.
SKU: 200190213 • Weight: 9.8oz
Availability: In Stock
Current Stock: Out of stock
The Knights Armament SR-25 A2 is a 7.62 NATO/.308 assembled upper receiver purpose-built for shooters who demand precision at distance. This commercial variant of the M110A2 system brings proven military accuracy and reliability to your semi-automatic rifle build. Whether you're assembling a long-range hunting upper, a precision carbine for the range, or a duty-grade platform, the SR-25 A2 delivers the engineering that made the M110 platform a standard in precision rifle work.
The 20-inch barrel features a 5R cut rifled profile with a 1:10-inch twist rate, paired with a high-pressure dual ejector bolt designed to function reliably in suppressed and unsuppressed configurations, even in tough conditions. Fully ambidextrous controls across the receiver mean both left- and right-handed shooters get full ergonomic advantage without compromise. The integrated 2-stage trigger is tuned to support precision work without requiring additional tuning or parts swaps.
Mounted to the upper is the URX6 handguard—a rigid, impact-resistant design with seven sides of M-LOK slots and a continuous MILSTD-1913 rail across the top. This gives you maximum flexibility to mount optics, lights, lasers, or other modern accessories. The 7.62mm open brake mitigates recoil and is compatible with KAC 7.62mm QDC Signature Reduction Devices, so you can suppress this upper if your setup calls for it.
This is a complete assembled upper receiver—bolt carrier group and trigger are installed and ready to mate with your compatible lower receiver. It's a no-compromise choice for builders who refuse to compromise on accuracy or durability.
| Caliber | 7.62 NATO/.308 Winchester |
| Barrel Length | 20 inches |
| Barrel Profile | 5R cut rifled, dimpled |
| Twist Rate | 1:10 inch |
| Controls | Fully ambidextrous |
| Trigger | 2-stage drop-in trigger |
| Handguard | URX6 with M-LOK and MILSTD-1913 rail |
| Muzzle Device | 7.62mm open brake |
| Finish | Black |
The SR-25 A2 is an assembled upper receiver designed to pair with AR-10 pattern lower receivers that accept 7.62 NATO/.308 Winchester ammunition. Verify compatibility with your specific lower receiver before assembly.
Yes. The 7.62mm open brake is compatible with KAC 7.62mm QDC Signature Reduction Devices. The dual ejector bolt is specifically designed to cycle reliably both suppressed and unsuppressed.
Yes, this is a complete assembled upper receiver with the bolt carrier group and 2-stage trigger installed. You'll need to attach it to a compatible AR-10 lower receiver to complete your rifle.
The URX6 handguard features seven sides of M-LOK slots for mounting custom rail sections and accessories, plus a continuous MILSTD-1913 rail across the top for direct attachment of optics, lights, and other standard rail-mounted gear.
SKU: 200190213 • Weight: 9.8oz